SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25456 full-text translations 14926 English PDFs 22540 abstracts
Showing 50 of 25456 papers
This study investigates the fission of antimony nuclei induced by 660 MeV protons, addressing the limited experimental information available for fission in medium atomic weight elements. Highly purified antimony targets were irradiated, fission products with atomic numbers from 11 to 37 were chemica…
This paper develops a direct method for deriving equations for pulse automatic systems with amplitude-pulse modulation of the second kind, where the pulse element periodically closes and opens the control circuit. Using the discrete Laplace transform, the closed-loop system is formulated as a Fredho…
This paper studies whether a closed regular convex surface of positive Gaussian curvature, after removal of finitely many points, can admit nontrivial isometric transformations within the class of regular surfaces. Focusing on the case of two punctures, it constructs auxiliary Riemannian and locally…
This study examines the composition of products formed in the reaction of vanadium oxytrichloride with triethylaluminum, a catalyst-forming system relevant to stereospecific polymerization. Using reactions in benzene under oxygen- and moisture-free conditions, the authors analyzed precipitates, filt…
This study examines the catalytic demethylation of ortho, meta, and para cresols to phenol in the presence of excess water vapor over nickel alumina catalysts at 410 to 470°C. Using a flow reactor and chromatographic analysis of liquid and gaseous products, the authors compare catalyst composition, …
The paper studies tame and normal embeddings of triangulable manifolds and elements in Euclidean spaces, with emphasis on when normality implies tameness. Using consequences of Brown’s results on cellular sets and spheres, it proves a necessary and sufficient criterion for a tame embedding of a k-di…
This study examines the configurations and conformations of four glycidic alcohols obtained by oxidation of cis and trans 2-methyl-1-vinylcyclohexanols, using combination light-scattering spectra in the liquid state and in carbon tetrachloride solution. Analysis of hydroxyl, oxirane-ring, and cycloh…
This study examines the chemisorption of absolute isopropyl alcohol at 30 degrees C on mixed catalysts based on gamma alumina, containing NiO, Fe2O3, Cr2O3, or ZrO2, and evaluates the effect of adding K2O. Using gravimetric adsorption measurements and surface area determinations from nitrogen and be…
This study examines copper salt promoted nucleophilic substitution of bromine in 1′-bromo-1-acetylferrocene and 1′-bromo-1-ethylferrocene. 1′-Bromo-1-acetylferrocene was prepared by acylation of bromoferrocene, and its bromine was found to be replaced by acetoxy only with difficulty, yielding 1′-hyd…
This study examines how the radioactivity of molybdenum anhydride affects its evaporation rate, using preparations containing different amounts of molybdenum-99 and comparing them with nonradioactive samples. The authors measured evaporation at 700 degrees in a dry air stream with controlled sample …
This study examines how substituents in arylhydrazones affect their conversion into indole derivatives in the Fischer reaction, with particular attention to the staged formation and rearrangement of acetylated enehydrazine intermediates. A series of arylhydrazones was acetylated and then subjected t…
This paper examines the hydrogenation of furan-series amines as a route to nitrogen-containing five-membered heterocycles, based on the expectation that an amino group in the side chain can cyclize with hydroxyl or carbonyl functions produced by hydrogenolysis of the furan ring. The authors synthesi…
This paper examines the interpretation of S-shaped viscosity isotherms in binary liquid systems and their relation to other established types of viscosity diagrams. By comparing series of acid systems in which the degree of chemical interaction is known from independent evidence, the author argues t…
This study reexamines the addition of iodine chloride to chlorotrifluoroethylene, previously regarded as giving a single product through an ionic mechanism. Fractionation, treatment with oleum, conversion of resulting acyl fluorides to ethyl esters, and comparison with material recovered from tetraf…
The study examines the separate polymerization of isoprene and its copolymerization with styrene in benzene using an alpha titanium trichloride and triethylaluminum catalyst system. Kinetic measurements by dilatometry, supported by molecular weight and infrared compositional analyses, are interprete…
This paper studies one-to-one alphabetic coding without memory over a finite output alphabet, focusing on variable-length codes and the conditions under which decoding can be performed with finite delay. Using a finite-state graph associated with a coding system, it gives necessary and sufficient gr…
This paper examines the condensation of indandione-1,3 with aliphatic aldehydes, a reaction previously reported to give uncertain or competing products beyond the lower homologs. The authors show that conducting the reaction in cold alkaline medium, with stirring when needed, suppresses self-condens…
This study examines the kinetic energy distribution of electrons emitted in the external photoelectric effect from thin layers of organic dyes, with films prepared either from alcoholic solution or by vacuum sublimation. Using current voltage measurements and electron energy distribution curves, the…
This paper examines reactions of benzoyl peroxide and acetylbenzoyl peroxide with organometallic derivatives of tin, lead, and silicon under oxygen-free conditions, focusing on whether homolytic bond cleavage proceeds through free radicals, active complexes, or both. Product analysis, including gase…
This paper analyzes self-similar relativistic gas motions with plane, cylindrical, and spherical symmetry for adiabatic equations of state. It derives reduced systems for two classes of self-similar solutions, showing that relativistic velocity bounds force the similarity exponent associated with ve…
The paper studies linear systems of ordinary differential equations with general two point boundary conditions and proposes reducing them to a sequence of simpler boundary value problems in which prescribed components are split between the endpoints, including the Cauchy problem as a special case. I…
Phase equilibrium was investigated along the Ti3Sn, Zr section of the ternary titanium, zirconium, tin system, motivated by structural similarities between alpha zirconium and Ti3Sn and by the possibility of continuous solid solution formation. Alloys were prepared by crucibleless induction melting,…
This study examines the coprecipitation and sorption of trace germanium from aqueous solution by freshly formed aluminum hydroxide, varying germanium concentration, suspension pH, temperature, contact time, and aluminum to germanium ratio. Experiments showed nearly quantitative sorption around pH 6 …
This paper studies first boundary-value problems for certain quasilinear parabolic systems whose first-order coefficients may grow rapidly in the unknown functions. It derives an a priori integral estimate by introducing a convex solution of an associated second-order equation in the variables of th…
This study examines the electrical properties of alkaline-earth, rare-earth, and thorium hexaborides, motivated by their physical interest and cathode applications. Specific resistivity, Hall coefficient, thermoelectric emf, and temperature coefficient of resistivity were measured on the same hot-pr…
This study examines whether molecular deuterium can be used in thermal decomposition reactions to determine rate constants and activation energies for elementary radical processes, as had been done in photochemical systems. Methyl radicals generated by pyrolysis of acetaldehyde, acetone, dimethylmer…
The paper studies the non-self-adjoint half-line differential operator defined by a complex boundary condition and a continuous potential, focusing on the structure of its discrete spectrum and singular, or exceptional, points on the continuous spectrum. It gives criteria, based on moment and quasi-…
This paper proposes a statistical operator for nonequilibrium systems intended to generalize the Gibbs distribution while remaining consistent with Liouville’s theorem. Using local conservation laws for energy and particle number, it constructs local integrals of motion that include time integrals o…
This paper classifies integral indecomposable representations of the four-group generated by two commuting involutions, equivalently pairs of commuting integral unimodular matrices whose squares are the identity. The argument separates a natural sublattice on which the two generators agree, reduces …
The paper investigates low-frequency infrared absorption associated with hydrogen-bond vibrations in liquid ordinary and heavy water, and in several crystal hydrates. Using long-wavelength infrared spectrometry over roughly 42 to 200 micrometers, the authors observe weak structure within the broad t…
This paper develops a priori estimates in fractional and anisotropic Sobolev type spaces for several elliptic and parabolic boundary value problems. It introduces and compares function spaces defined through directional difference and derivative norms, proves trace and extension results including ex…
This paper examines the structural mechanism of the ferroelectric phase transition in thiourea at 133 K, comparing the low-temperature ferroelectric phase with the high-temperature antiferroelectric phase. Using electron diffraction, dynamical corrections, Fourier potential synthesis, and difference…
This note proves a uniqueness theorem for an inverse problem of the metaharmonic volume potential for bounded simply connected bodies of equal constant density in three-dimensional space. Using methods from earlier work on inverse potential problems, it considers two piecewise smooth bodies whose ex…
This note defines characteristic classes for complex representations of finite groups by applying Chern classes to the vector bundle over the Eilenberg-MacLane space associated with a representation. The construction is formulated as a natural transformation from the representation ring, viewed as a…
This note proves a Phragmen-Lindelof type uniqueness theorem for harmonic functions in a rectangular cylinder with zero boundary values, bounded normal derivative on two opposite faces, and prescribed double exponential growth in the axial variable. The proof expands the function in sine eigenfuncti…
The paper addresses the construction of transfer matrix functions for complex multiloop automatic control systems, where direct and feedback couplings between loops make purely algebraic derivations cumbersome and error prone. It proposes representing opened multiloop systems as cascades of multi-te…
The study examines the polymerization behavior of cyano-containing alkenyl organosilicon compounds, especially cyanoisopropoxyalkenylsilanes, under radical and platinum-catalyzed conditions. Polymerizations were conducted under high pressure with peroxide or azodiisobutyronitrile initiators, and at …
This note studies the second order differential operator on the half-line defined by \(-y''+q(x)y\) with a separated boundary condition at the origin, focusing on sufficient conditions under which the operator is not self-adjoint and has deficiency indices \((1,1)\). It derives an a priori estimate …
This paper investigates electrostatic effects arising when a rarefied two-component plasma moves through an inhomogeneous magnetic field, where unequal electron and ion motion produces charge separation and a finite potential jump. Using a drift kinetic description for a plane stationary flow with m…
This paper investigates the dissociation rate of oxygen molecules at high temperatures relevant to gases behind strong shock waves. Using shock tube experiments with time-resolved ultraviolet absorption at 2275 Å, the study infers temperature and molecular oxygen concentration profiles in the early …
This note extends the length and area principle from analytic functions to non-univalent Q-quasiconformal interior mappings of arbitrary plane domains. It formulates an integral inequality relating the total spherical length of level curves of the mapping, the average multiplicity of preimages, and …
This paper compares measured and calculated formation cross sections for polonium isotopes produced in the reaction Bi-209(p,xn)Po at a bombarding proton energy of 135 MeV. Experimental yields of Po-200 through Po-209 were determined from alpha activity and daughter-product activity after chemical s…
This study examines the dehydration of cycloaliphatic alpha-ketols in the cyclohexane and delta-3-cyclohexene series, focusing on the effects of ring unsaturation and methyl substituent position. The authors prepare ketols from acetylenic alcohols and by hydrogenation, dehydrate them under acidic co…
The paper studies effective solution methods for singular Tricomi problems associated with the Chaplygin equation arising in transonic flow theory. It constructs Duhamel type Riemann resolvents for the first and second singular Tricomi boundary value problems by transforming the equation, expanding …
This paper reports centimeter wavelength observations with the Pulkovo radio telescope that identified a Galactic radio source at 9.4 cm and compared its position and flux with entries in existing radio catalogs. From the measured angular size, fluxes at several wavelengths, and absence of correspon…
This paper reassesses ionization and recombination in the Earth’s ionosphere in light of rocket and satellite measurements of ion composition and solar ultraviolet radiation. It argues that charge exchange converts atomic ions into molecular ions, whose dissociative recombination dominates ion neutr…
This paper studies the representation of solutions of homogeneous partial differential equations with constant coefficients as Fourier transforms of functionals supported on the zero set of the defining polynomial. It formulates and proves, for several spaces of entire functions, generalized functio…
This paper develops a unified analytic-function formulation for the first and second basic axisymmetric problems of elasticity for both solid bodies and spaces containing cavities. Starting from integral relations between plane elastic states and axisymmetric states, it derives contour integral expr…
This study examines the structural and mechanical properties of individual gelatin fibers as model elements of leather tissue, with particular attention to changes produced by chromium tanning. The authors measure deformation under constant uniaxial load and the subsequent decay of deformation after…
This paper analyzes round-off errors in the numerical solution of consistent systems of linear algebraic equations with symmetric matrices, focusing on the Cholesky method for floating-point binary machines. Under explicit assumptions on errors in arithmetic operations, it derives bounds for the res…
